Added doc/author_holke.txt
Implemented the p4est_ghost_is_valid function.
 Improved the p4est_ghost_is_valid function.
Update to p4est_ghost_is_valid.
Edited a comment.
Added a comment.
Improved the p4est_ghost_is_valid function.
 Improved the p4est_ghost_is_valid function.
Fixed bugs in p4est_ghost_is_valid.
Repaired a failed merge.
Fixed an operator precedence error.
Update issue
Cosmetic changes to ghost_is_valid
Activate check with p4est_ghost_is_valid
Submit issue on ghost
Merge Johannes' author file into develop
p4est_ghost_is_valid